Borealis Ag

Pasi Matikainen

Erik A Eriksson

Timo Leinonen

Peter Denifl

Sameer Vijay

Erno Elovainio

Lauri Huhtanen

Tuomas Ouni

Samuli Zitting

Pertti Elo

Mikko Lylykangas

Ismo Lehtiniemi

Michael Bartke

Kimmo Hakala

Soile Rautio

Henrik Andtsjö

Tom Elovirta

Jukka-Pekka Parjanen

Jeannette Aumo

Emilia Helisevä

Peter Ernst

Miika Vihavainen

Claes Hedvall

Juha Visuri

Mika Kuusisto

Jeanette Aumo

Jukka Räsänen

A process for washing a particulate substance comprising: (i) combining a particulate substance and a first washing medium in a first vessel to form a slurry and washing the particulate substance with said washing medium; (ii) transferring the slurry to a hydrocyclone; (iii) removing a first by-product stream depleted in particulate substance and a first product stream enriched in particulate substance from the hydrocyclone; (iv) transferring the first product stream to a second vessel and in the presence of a second washing medium forming a slurry and washing the particulate substance with said second washing medium e.g. by agitation thereof; (v) transferring the slurry to a hydrocyclone; (vi) removing a second by-product stream depleted in particulate substance and a second product stream enriched in particulate substance from the hydrocyclone.

Washing process

The present invention is directed to a process for producing a solid olefin polymerization catalyst component from an emulsion wherein the particle size of the solid catalyst or the droplet size of the emulsion is controlled. The actual size of the droplets or the solid catalyst particles is measured, or alternatively, both are measured. Then a difference between the actual size and the set point is calculated and the process is controlled based on the difference.

Method for producing an olefin polymerization catalyst

The present application provides a process for polymerizing at least one olefin in the presence of a polymerization catalyst, including: (A) continuously introducing a first liquid with a transition metal compound, an organometallic compound, and a solvent and a second liquid into an emulsification stage, (B) continuously withdrawing the emulsion and directing it into a solidification stage to form a slurry with a solid polymerization catalyst component, (C) continuously recovering the solid polymerization catalyst component, (D) directing the solid polymerization catalyst component into a first prepolymerization stage with a monomer and a second liquid to form a slurry, (E) recovering a prepolymerized solid polymerization catalyst component, (F) continuously introducing the prepolymerized solid polymerization catalyst component into a second prepolymerization stage with an olefin monomer to form a prepolymerized catalyst, and (G) continuously withdrawing the prepolymerized catalyst and directing it into a subsequent polymerization stage with at least one olefin monomer.

Process for olefin polymerization

Growing community of inventors

Espoo, Finland

Pasi Matikainen